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Q

How many devices can I have on a single SCSI Chain?

A

SCSI has provisions for 16 IDs per channel, but cabling limitations of parallel SCSI allow reliable operations of no more than 3-4 devices on a single chain. Note that this limits number of cabled connections; enclosures capable of multiple devices will count as 1 device for this purpose.

Q

Is my MicroNet SCSI drive compatible with my SCSI host bus adapter?

A

With the exception of HVD (high voltage differential) SCSI, SCSI is a standard interface and as such should make all SCSI devices compatible with each other, at the lowest common denominator of features. However, there are firmware, host architecture, OS architecture and versions, driver limitations, and other specific and non-specific limitations that we cannot foresee; consult your host bus adapter vendors for information specific to your operating environment.

Q

My SCSI MicroNet is not detected

A

Use the following troubleshooting procedure: 

  1. Shut down your system and turn off power to all devices. 
  2. Disconnect all external devices
  3. If available, use the cable originally shipped with your device. Alternatively, use a high quality cable to connect the drive directly to your computers SCSI port. 
  4. Terminate the appropriate port on the back of the drive. 
  5. Turn on the power to the drive. Verify that the MicroNet device power up, and the diagnostic light on the terminator is on. 
  6. (PC) enter your SCSI host bus adapter BIOS utilities. Consult your HBA vendor for more information on this procedure. If the SCSI HBA recognizes the device, proceed to step 7. If the disk is not recognized, check that your SCSI host bus adapter and the MicroNet device have different SCSI IDs. If the problem persists, replace the cable and/or terminator and try again. 
  7. If the drive is not seen in disk utility (Mac) or device manager (PC) verify that the device drive for your SCSI host bus adapter are properly installed and functioning. If the device worked before it may be defective.
  8. If the disk is seen but the volume is gone, refer to the QA article "Q: My Drive was working fine yesterday but now its gone! " 
  9. Continue adding devices to your SCSI bus until all of your devices have been re-hooked to your bus. If you get to a point to where if you add another device, it no longer functions properly- you need to verify your SCSI setup against SCSI guidelines. 
  10. Once you have a working setup, LEAVE IT ALONE. This will only cease to work if you change something in your system software, or the physical setup of your bus. If this happens, you will need to repeat the above troubleshooting steps.
Q

The drive locks up my computer at startup.

A

Make sure your MicroNet SCSI drive has a unique SCSI ID. Check for possible SCSI ID conflicts. Be aware that the internal hard drive the internal CD ROM are likely sharing the SCSI bus even if they're inside your computer. Isolate the *drive on your SCSI bus. If it works, you have an unstable SCSI bus. See the article "Q: I can't see my SCSI MicroNet device!" for additional troubleshooting.

Q

What is A SCSI terminator?

A

 

A SCSI terminator is a device that absorbs the computer signals at the end of the SCSI chain so they are not reflected back along the bus. Common termination errors are data corruption, missing devices, intermittent read/write errors, and a variety of other mysterious problems. Terminators are available as active or passive variants. PASSIVE terminators will only absorb signal, preventing the reflection back along the bus but offering no stabilization of signal voltage.
ACTIVE terminators will not only absorb signal at the end of the SCSI bus, they will stabilize, or assist in maintaining adequate voltage along the bus. As the lengths of cable increase, the voltage at each device drops. An active terminator at the end of the bus will help to insure there is adequate voltage along the chain MicroNet includes an Active multimode terminator with every MicroNet SCSI device, which must be plugged in to the second connector of the last SCSI

 

Q

What’s the longest cable length for my SCSI chain? How many SCSI devices can I have on a SCSI chain? How fast is SCSI (x)?

A

 

SCSI Version
Bus 
Width
Voltage
Bus 
Speed
Max 
IDs
Cabling
Maximum
Length
SCSI-I
8-bit
Single Ended
5MB/S
8
25pin straight
6M
SCSI-2 (Fast)
8-bit
Single Ended
20MB/S
8
50pin straight
3M
SCSI-3 
(Fast/Wide)
16-bit
Single Ended
40MB/S
16
68 pin straight
3M
Ultra-2
16-bit
LVD
80MB/S
16
68 pin twisted
12M
Ultra160
16-bit
LVD
160MB/S
16
68 pin twisted
12M
Ultra320
16-bit
LVD
320MB/S
16
68 pin twisted
12M
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